drivers/ide/ide-gd.c

   1 #include <linux/module.h>
   2 #include <linux/types.h>
   3 #include <linux/string.h>
   4 #include <linux/kernel.h>
   5 #include <linux/errno.h>
   6 #include <linux/genhd.h>
   7 #include <linux/mutex.h>
   8 #include <linux/ide.h>
   9 #include <linux/hdreg.h>
  10 #include <linux/dmi.h>
  11
  12 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
  13 #define IDE_DISK_MINORS         (1 << PARTN_BITS)
  14 #else
  15 #define IDE_DISK_MINORS         0
  16 #endif
  17
  18 #include "ide-disk.h"
  19 #include "ide-floppy.h"
  20
  21 #define IDE_GD_VERSION  "1.18"
  22
  23 /* module parameters */
  24 static unsigned long debug_mask;
  25 module_param(debug_mask, ulong, 0644);
  26
  27 static DEFINE_MUTEX(ide_disk_ref_mutex);
  28
  29 static void ide_disk_release(struct device *);
  30
  31 static struct ide_disk_obj *ide_disk_get(struct gendisk *disk)
  32 {
  33         struct ide_disk_obj *idkp = NULL;
  34
  35         mutex_lock(&ide_disk_ref_mutex);
  36         idkp = ide_drv_g(disk, ide_disk_obj);
  37         if (idkp) {
  38                 if (ide_device_get(idkp->drive))
  39                         idkp = NULL;
  40                 else
  41                         get_device(&idkp->dev);
  42         }
  43         mutex_unlock(&ide_disk_ref_mutex);
  44         return idkp;
  45 }
  46
  47 static void ide_disk_put(struct ide_disk_obj *idkp)
  48 {
  49         ide_drive_t *drive = idkp->drive;
  50
  51         mutex_lock(&ide_disk_ref_mutex);
  52         put_device(&idkp->dev);
  53         ide_device_put(drive);
  54         mutex_unlock(&ide_disk_ref_mutex);
  55 }
  56
  57 sector_t ide_gd_capacity(ide_drive_t *drive)
  58 {
  59         return drive->capacity64;
  60 }
  61
  62 static int ide_gd_probe(ide_drive_t *);
  63
  64 static void ide_gd_remove(ide_drive_t *drive)
  65 {
  66         struct ide_disk_obj *idkp = drive->driver_data;
  67         struct gendisk *g = idkp->disk;
  68
  69         ide_proc_unregister_driver(drive, idkp->driver);
  70         device_del(&idkp->dev);
  71         del_gendisk(g);
  72         drive->disk_ops->flush(drive);
  73
  74         mutex_lock(&ide_disk_ref_mutex);
  75         put_device(&idkp->dev);
  76         mutex_unlock(&ide_disk_ref_mutex);
  77 }
  78
  79 static void ide_disk_release(struct device *dev)
  80 {
  81         struct ide_disk_obj *idkp = to_ide_drv(dev, ide_disk_obj);
  82         ide_drive_t *drive = idkp->drive;
  83         struct gendisk *g = idkp->disk;
  84
  85         drive->disk_ops = NULL;
  86         drive->driver_data = NULL;
  87         g->private_data = NULL;
  88         put_disk(g);
  89         kfree(idkp);
  90 }
  91
  92 /*
  93  * On HPA drives the capacity needs to be
  94  * reinitilized on resume otherwise the disk
  95  * can not be used and a hard reset is required
  96  */
  97 static void ide_gd_resume(ide_drive_t *drive)
  98 {
  99         if (ata_id_hpa_enabled(drive->id))
 100                 (void)drive->disk_ops->get_capacity(drive);
 101 }
 102
 103 static const struct dmi_system_id ide_coldreboot_table[] = {
 104         {
 105                 /* Acer TravelMate 66x cuts power during reboot */
 106                 .ident   = "Acer TravelMate 660",
 107                 .matches = {
 108                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 109                         DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 660"),
 110                 },
 111         },
 112
 113         { }     /* terminate list */
 114 };
 115
 116 static void ide_gd_shutdown(ide_drive_t *drive)
 117 {
 118 #ifdef  CONFIG_ALPHA
 119         /* On Alpha, halt(8) doesn't actually turn the machine off,
 120            it puts you into the sort of firmware monitor. Typically,
 121            it's used to boot another kernel image, so it's not much
 122            different from reboot(8). Therefore, we don't need to
 123            spin down the disk in this case, especially since Alpha
 124            firmware doesn't handle disks in standby mode properly.
 125            On the other hand, it's reasonably safe to turn the power
 126            off when the shutdown process reaches the firmware prompt,
 127            as the firmware initialization takes rather long time -
 128            at least 10 seconds, which should be sufficient for
 129            the disk to expire its write cache. */
 130         if (system_state != SYSTEM_POWER_OFF) {
 131 #else
 132         if (system_state == SYSTEM_RESTART &&
 133                 !dmi_check_system(ide_coldreboot_table)) {
 134 #endif
 135                 drive->disk_ops->flush(drive);
 136                 return;
 137         }
 138
 139         printk(KERN_INFO "Shutdown: %s\n", drive->name);
 140
 141         drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND);
 142 }
 143
 144 #ifdef CONFIG_IDE_PROC_FS
 145 static ide_proc_entry_t *ide_disk_proc_entries(ide_drive_t *drive)
 146 {
 147         return (drive->media == ide_disk) ? ide_disk_proc : ide_floppy_proc;
 148 }
 149
 150 static const struct ide_proc_devset *ide_disk_proc_devsets(ide_drive_t *drive)
 151 {
 152         return (drive->media == ide_disk) ? ide_disk_settings
 153                                           : ide_floppy_settings;
 154 }
 155 #endif
 156
 157 static ide_startstop_t ide_gd_do_request(ide_drive_t *drive,
 158                                          struct request *rq, sector_t sector)
 159 {
 160         return drive->disk_ops->do_request(drive, rq, sector);
 161 }
 162
 163 static struct ide_driver ide_gd_driver = {
 164         .gen_driver = {
 165                 .owner          = THIS_MODULE,
 166                 .name           = "ide-gd",
 167                 .bus            = &ide_bus_type,
 168         },
 169         .probe                  = ide_gd_probe,
 170         .remove                 = ide_gd_remove,
 171         .resume                 = ide_gd_resume,
 172         .shutdown               = ide_gd_shutdown,
 173         .version                = IDE_GD_VERSION,
 174         .do_request             = ide_gd_do_request,
 175 #ifdef CONFIG_IDE_PROC_FS
 176         .proc_entries           = ide_disk_proc_entries,
 177         .proc_devsets           = ide_disk_proc_devsets,
 178 #endif
 179 };
 180
 181 static int ide_gd_open(struct block_device *bdev, fmode_t mode)
 182 {
 183         struct gendisk *disk = bdev->bd_disk;
 184         struct ide_disk_obj *idkp;
 185         ide_drive_t *drive;
 186         int ret = 0;
 187
 188         idkp = ide_disk_get(disk);
 189         if (idkp == NULL)
 190                 return -ENXIO;
 191
 192         drive = idkp->drive;
 193
 194         ide_debug_log(IDE_DBG_FUNC, "enter");
 195
 196         idkp->openers++;
 197
 198         if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
 199                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
 200                 /* Just in case */
 201
 202                 ret = drive->disk_ops->init_media(drive, disk);
 203
 204                 /*
 205                  * Allow O_NDELAY to open a drive without a disk, or with an
 206                  * unreadable disk, so that we can get the format capacity
 207                  * of the drive or begin the format - Sam
 208                  */
 209                 if (ret && (mode & FMODE_NDELAY) == 0) {
 210                         ret = -EIO;
 211                         goto out_put_idkp;
 212                 }
 213
 214                 if ((drive->dev_flags & IDE_DFLAG_WP) && (mode & FMODE_WRITE)) {
 215                         ret = -EROFS;
 216                         goto out_put_idkp;
 217                 }
 218
 219                 /*
 220                  * Ignore the return code from door_lock,
 221                  * since the open() has already succeeded,
 222                  * and the door_lock is irrelevant at this point.
 223                  */
 224                 drive->disk_ops->set_doorlock(drive, disk, 1);
 225                 drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
 226                 check_disk_change(bdev);
 227         } else if (drive->dev_flags & IDE_DFLAG_FORMAT_IN_PROGRESS) {
 228                 ret = -EBUSY;
 229                 goto out_put_idkp;
 230         }
 231         return 0;
 232
 233 out_put_idkp:
 234         idkp->openers--;
 235         ide_disk_put(idkp);
 236         return ret;
 237 }
 238
 239 static int ide_gd_release(struct gendisk *disk, fmode_t mode)
 240 {
 241         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 242         ide_drive_t *drive = idkp->drive;
 243
 244         ide_debug_log(IDE_DBG_FUNC, "enter");
 245
 246         if (idkp->openers == 1)
 247                 drive->disk_ops->flush(drive);
 248
 249         if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
 250                 drive->disk_ops->set_doorlock(drive, disk, 0);
 251                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
 252         }
 253
 254         idkp->openers--;
 255
 256         ide_disk_put(idkp);
 257
 258         return 0;
 259 }
 260
 261 static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 262 {
 263         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
 264         ide_drive_t *drive = idkp->drive;
 265
 266         geo->heads = drive->bios_head;
 267         geo->sectors = drive->bios_sect;
 268         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
 269         return 0;
 270 }
 271
 272 static int ide_gd_media_changed(struct gendisk *disk)
 273 {
 274         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 275         ide_drive_t *drive = idkp->drive;
 276         int ret;
 277
 278         /* do not scan partitions twice if this is a removable device */
 279         if (drive->dev_flags & IDE_DFLAG_ATTACH) {
 280                 drive->dev_flags &= ~IDE_DFLAG_ATTACH;
 281                 return 0;
 282         }
 283
 284         ret = !!(drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED);
 285         drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
 286
 287         return ret;
 288 }
 289
 290 static unsigned long long ide_gd_set_capacity(struct gendisk *disk,
 291                                               unsigned long long capacity)
 292 {
 293         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 294         ide_drive_t *drive = idkp->drive;
 295         const struct ide_disk_ops *disk_ops = drive->disk_ops;
 296
 297         if (disk_ops->set_capacity)
 298                 return disk_ops->set_capacity(drive, capacity);
 299
 300         return drive->capacity64;
 301 }
 302
 303 static int ide_gd_revalidate_disk(struct gendisk *disk)
 304 {
 305         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
 306         ide_drive_t *drive = idkp->drive;
 307
 308         if (ide_gd_media_changed(disk))
 309                 drive->disk_ops->get_capacity(drive);
 310
 311         set_capacity(disk, ide_gd_capacity(drive));
 312         return 0;
 313 }
 314
 315 static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
 316                              unsigned int cmd, unsigned long arg)
 317 {
 318         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
 319         ide_drive_t *drive = idkp->drive;
 320
 321         return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg);
 322 }
 323
 324 static const struct block_device_operations ide_gd_ops = {
 325         .owner                  = THIS_MODULE,
 326         .open                   = ide_gd_open,
 327         .release                = ide_gd_release,
 328         .locked_ioctl           = ide_gd_ioctl,
 329         .getgeo                 = ide_gd_getgeo,
 330         .media_changed          = ide_gd_media_changed,
 331         .set_capacity           = ide_gd_set_capacity,
 332         .revalidate_disk        = ide_gd_revalidate_disk
 333 };
 334
 335 static int ide_gd_probe(ide_drive_t *drive)
 336 {
 337         const struct ide_disk_ops *disk_ops = NULL;
 338         struct ide_disk_obj *idkp;
 339         struct gendisk *g;
 340
 341         /* strstr("foo", "") is non-NULL */
 342         if (!strstr("ide-gd", drive->driver_req))
 343                 goto failed;
 344
 345 #ifdef CONFIG_IDE_GD_ATA
 346         if (drive->media == ide_disk)
 347                 disk_ops = &ide_ata_disk_ops;
 348 #endif
 349 #ifdef CONFIG_IDE_GD_ATAPI
 350         if (drive->media == ide_floppy)
 351                 disk_ops = &ide_atapi_disk_ops;
 352 #endif
 353         if (disk_ops == NULL)
 354                 goto failed;
 355
 356         if (disk_ops->check(drive, DRV_NAME) == 0) {
 357                 printk(KERN_ERR PFX "%s: not supported by this driver\n",
 358                         drive->name);
 359                 goto failed;
 360         }
 361
 362         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
 363         if (!idkp) {
 364                 printk(KERN_ERR PFX "%s: can't allocate a disk structure\n",
 365                         drive->name);
 366                 goto failed;
 367         }
 368
 369         g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif));
 370         if (!g)
 371                 goto out_free_idkp;
 372
 373         ide_init_disk(g, drive);
 374
 375         idkp->dev.parent = &drive->gendev;
 376         idkp->dev.release = ide_disk_release;
 377         dev_set_name(&idkp->dev, dev_name(&drive->gendev));
 378
 379         if (device_register(&idkp->dev))
 380                 goto out_free_disk;
 381
 382         idkp->drive = drive;
 383         idkp->driver = &ide_gd_driver;
 384         idkp->disk = g;
 385
 386         g->private_data = &idkp->driver;
 387
 388         drive->driver_data = idkp;
 389         drive->debug_mask = debug_mask;
 390         drive->disk_ops = disk_ops;
 391
 392         disk_ops->setup(drive);
 393
 394         set_capacity(g, ide_gd_capacity(drive));
 395
 396         g->minors = IDE_DISK_MINORS;
 397         g->driverfs_dev = &drive->gendev;
 398         g->flags |= GENHD_FL_EXT_DEVT;
 399         if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
 400                 g->flags = GENHD_FL_REMOVABLE;
 401         g->fops = &ide_gd_ops;
 402         add_disk(g);
 403         return 0;
 404
 405 out_free_disk:
 406         put_disk(g);
 407 out_free_idkp:
 408         kfree(idkp);
 409 failed:
 410         return -ENODEV;
 411 }
 412
 413 static int __init ide_gd_init(void)
 414 {
 415         printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n");
 416         return driver_register(&ide_gd_driver.gen_driver);
 417 }
 418
 419 static void __exit ide_gd_exit(void)
 420 {
 421         driver_unregister(&ide_gd_driver.gen_driver);
 422 }
 423
 424 MODULE_ALIAS("ide:*m-disk*");
 425 MODULE_ALIAS("ide-disk");
 426 MODULE_ALIAS("ide:*m-floppy*");
 427 MODULE_ALIAS("ide-floppy");
 428 module_init(ide_gd_init);
 429 module_exit(ide_gd_exit);
 430 MODULE_LICENSE("GPL");
 431 MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");